Noise-cancelling quadrature magnetic position, speed and directi

Details Noise-cancelling quadrature magnetic position, speed and directi Noise-cancelling quadrature magnetic position, speed and directi

1993-05-17

1996-02-06

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

3242072, G01B 714, G01R 33025, H01L 4306

Patent

active

054898447

ABSTRACT:
An array of three magnetic sensors in a single package is employed with a single bias magnet for sensing shaft position, speed and direction of a motor in a high magnetic noise environment. Two of the three magnetic sensors are situated in an anti-phase relationship (i.e., 180.degree. out-of-phase) with respect to the relationship between the other of the two sensors and magnetically salient target, and the third magnetic sensor is situated between the anti-phase sensors. The result is quadrature sensing with noise immunity for accurate relative position, speed and direction measurements.

REFERENCES:
patent: 4639674 (1987-01-01), Rippingale
patent: 5241267 (1993-08-01), Gleixner et al.

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